The A* Pathfinding Project version 2.9 has just been released, this is mostly a bug-fix update which addresses many known bugs.
First of all Unity 3 Compatibility.
Secondly, a bug which could cause units to stop getting path requests computed when a large number of units requested paths at the same time is now solved. The pathfinding query functions has been completely rewritten to use path queues which ensures all paths get computed in order.
For those of you who don't know what the A* Pathfinding Project is:
The A* Pathfinding Project is an easy to set up system for making pathfinding possible in your game.
With it's blazing fast speed and high customisability it's a great choice for integrating pathfinding into your games.
Read more here - http://arongranberg.com/unity/a-pathfinding/
Download the new version at the project homepage - http://arongranberg.com/unity/a-pathfinding/
Some features has been removed due to high crash-rate, multithreading and the beta version of navmesh saving.